CSPC Files for Secukinumab Biosimilar Marketing Approval, Accelerating Domestic Substitution in China's IL-17A Market China's Center for Drug Evaluation (CDE) has formally accepted a marketing application from CSPC Jushi Biopharm for SYS6012, a secukinumab biosimilar injection, classified as a Class 3.3 therapeutic biological product. Secukinumab, an IL-17A inhibitor originally marketed by Novartis as Cosentyx, is one of the world's best-selling biologics for autoimmune conditions including psoriasis, psoriatic arthritis, and ankylosing spondylitis. CSPC's candidate met predefined equivalence endpoints in a Phase III head-to-head trial, demonstrating high similarity to Cosentyx in efficacy, safety, pharmacokinetics, and immunogenicity. If approved, the biosimilar could benefit from indication extrapolation covering the reference product's full label. The filing positions CSPC as a front-runner in China's increasingly competitive IL-17A biosimilar landscape, where multiple domestic developers are advancing late-stage programs. The entry of domestic biosimilars is expected to drive down treatment costs and expand patient access, particularly for China's estimated 6.5 million psoriasis patients, as the IL-17A franchise undergoes a structural shift toward localized production and generic competition.